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#3230334 07/05/22 05:14 AM
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I have a quite nice Swedish ”Nordiska Pianofabriken” upright piano in my studio that has a problem with squeaky sounds from the sustain pedal.

I have tried to lubricate the noisy parts with Dry Lube PTFE spray. The squeaks goes away for a while but returns after about half an hours of playing. I had a thought to somehow lubricate with pulverized stearic. (Don’t know if this is the correct English name? Like powder made from candles.)

I’m not sure exactly where the noise come from but it is somewhere from the rotating rod that lift the dampers. Probably the three hinghes that holds it in place or perhaps towards the wood behind.

What are the best options to fix this?

Super thankful for any input! It would be such a shame to thrash such a nice piano just because of this. Sorry have no pitures at the moment but I guess this is quite a common problem / fix.

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If you post a lot of videos and photos here there’s a chance somebody might be able to help you. Or you could make your life easy and just hire a piano technician to come in and fix it. Pedal noises are a common problem, but can be very tricky at times to locate since the noises travel around the pedal system in unexpected ways. An experienced person can come in and fix in no time or if it is a complex case might take a long time.

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Linus,

It is always a process of elimination starting from the bottom up. You must gradually remove sections of the "power train" until you isolate the cause. "Squeak...grunt...grind...rub...chirp, etc" are all different types of friction sounds. There may also be more than one cause.

If it is where you think it is, it will require some disassembly. If you're not familiar with it, best to bring in someone experienced in this.

The fact that you have been temporarily successful at quieting the sound indicates that you are on the right track, but may very treating it incorrectly. Also, don't be fooled simply because it is a new piano. If you bought it from a dealer and it is still within warranty you should be having the dealer fix it at no cost (I think).

Peter Grey Piano Doctor


Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8
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Originally Posted by TimM_980
If you post a lot of videos and photos here there’s a chance somebody might be able to help you. Or you could make your life easy and just hire a piano technician to come in and fix it. Pedal noises are a common problem, but can be very tricky at times to locate since the noises travel around the pedal system in unexpected ways. An experienced person can come in and fix in no time or if it is a complex case might take a long time.

Thanks! I’ll try to upload some pictures/videos next time I’ll visit the studio.

The piano tech I talked to said he could maybe fix it, maybe not (if it’s because of wear) and that it might be just and hour of work or perhaps days of work if more complex. He charges around 100€/h so I thought if I could fix the noises myself he can then come and fix some of the hammers/machanics that need to be given some qualified professional love. If it’s not possible to find a relatively simple long term solution for the sqeaks there’s no point in spending a lot of money on this piano.

Yeah I figure it’s a common problem. That’s why I thought maybe someone could tell what kind of stuff to lubricate with. I’ve already located where it comes from by ear and evidently found the correct spot since it disappears for a while when lubricated.

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Originally Posted by P W Grey
Linus,

It is always a process of elimination starting from the bottom up. You must gradually remove sections of the "power train" until you isolate the cause. "Squeak...grunt...grind...rub...chirp, etc" are all different types of friction sounds. There may also be more than one cause.

If it is where you think it is, it will require some disassembly. If you're not familiar with it, best to bring in someone experienced in this.

The fact that you have been temporarily successful at quieting the sound indicates that you are on the right track, but may very treating it incorrectly. Also, don't be fooled simply because it is a new piano. If you bought it from a dealer and it is still within warranty you should be having the dealer fix it at no cost (I think).

Peter Grey Piano Doctor

Thank you! It was actually quite easy to find where the sqeaks originate from, the cause is harder but I guess it’s from normal wear. The piano is quite old, at least 50 years, probably more. It’s also easy to just remove the whole mechanics part and to reach the sqeaky area.

My main question is what you normally would lubricate this with? Metal parts, wooden parts, fabric, leather etc? Is my idea about PTFE Dry Lube spray or some kind of stearic candle flour on the right track?

Last edited by L i n u s; 07/09/22 04:14 AM.
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Squeaky pedal systems are especially common on modern pianos, especially Yamahas. I can’t image why it would take a technician hours, much less days to fix, though.

Usually, a drip of Protek does the trick and I never hear about it again. Would other lubes work? Maybe, but I’ve never tried (no idea what stearic candle flour is).

Modern verticals tend have plastic tips on the rod ends , and if lube doesn’t help it’s not hard to rebush the receiving holes on the levers with some felt.

Keep in mind that squeaks may originate somewhere else: the dampers themselves and their actuation rod. In that case, you’d have to remove the action and lube each damper (lever/spoon interfaces or sometimes rubbing springs) and/or the rod hangers. Again, Protek usually does the trick. I carry a small bottle with a 3” tip that can get anywhere.

But even with action removal, this shouldn’t take days or even hours, unless there’s some other necessary repair, like bridle strap replacement.

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In the old days they used bushing cloth to line metal anywhere another piece of metal would come in contact with it (e.g. a pin in a hole or a spring contact, etc.). Thus method holds up for a long time usually. These days rubber or plastic is the bushing and they NEVER last as long. (Quick and cheap though...so that's always a good thing 😉)

Peter Grey Piano Doctor


Peter W. Grey, RPT
New Hampshire Seacoast
www.seacoastpianodoctor.com
pianodoctor57@gmail.com
https://www.youtube.com/watch?v=PK0T7_I_nV8

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